Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4828ec13ff97d5d…

MALICIOUS

PDF

40.5 KB Created: 2020-08-29 07:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14b959652ae8f65d0660ed56897a1725 SHA-1: fd1eea74be2b7a1ff6f9e76b0d25fa0de602548f SHA-256: e4828ec13ff97d5d1f47096fcb61a9c493338547556c50e24e52317ce45dd729
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though partially garbled, contains text related to monitoring encrypted channels, suggesting a social engineering lure. The presence of numerous embedded links, many pointing to Shopify domains, further supports the link farm and redirection attack pattern. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=internetten+%25C5%259Fifreli+kanallar%25C4%25B1+izleme+program%25C4%25B1
    • https://static.usrfiles.com/ugd/b8c837_c55019ade4024104a892c4b645c23a46.pdf
    • https://static.usrfiles.com/ugd/b8c837_e83cb3f7aa5748c1ab91b8ec145a8655.pdf
    • https://static.usrfiles.com/ugd/b8c837_01dff94f677c43b0b26f763c251e3641.pdf
    • https://static.usrfiles.com/ugd/b8c837_99d81550f2d043c0ae25a9aa20ca5d12.pdf
    • https://cdn.shopify.com/s/files/1/0450/6599/4392/files/30601236804.pdf
    • https://cdn.shopify.com/s/files/1/0434/2838/0839/files/84847150346.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/56717195208.pdf
    • https://cdn.shopify.com/s/files/1/0428/8518/5702/files/vudumelubamenujazeregu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2881/4741/files/fifenatesudufimamogudu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/michelin_guide_alsace_lorraine_champagne.pdf
    • https://cdn.shopify.com/s/files/1/0438/2461/1478/files/tilekinemumal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ce7.bin
eb3c5860480d0f7bbebc580f2d53e7649c4e33d8821a339c97d190fcadf2c428
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE7 5372 bytes
font_01_sfnt_off00006f22.bin
0521e5d978e60a66432783a65e7387b7d6c5b4c30d5f974c3f80d069fe8ac10c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F22 11468 bytes